Directional lighting seismic exploration method based on single earthquake focus

Abstract

The invention relates to a seismic prospecting method based on a single seismic focus directional lighting. An offset distance and a track pitch are determined according to the traditional geologic prospecting method; a wave-detector array is arranged in a collinear way; according to the different offset distance of the shot-points in the same group and the same offset distance of the m shot-points in the different groups with the serial number differing in n, seismic data in a single shot on an entire cross-section is gathered; a uniformly-spaced time delay is made for the seismic data in the single-shot in the same group according to the sequence of the serial number; a linear superposition is made for the delayed seismic data in the single-shot so as to compose a directional lighting seismic signal with directivity, and the directional lighting seismic signal is corresponding to a directional seismic wave field; by adopting a routine seismic data processing method, a directional lighting seismic cross-section based on the single seismic focus can be obtained. After a test, the direction of the directional lighting seismic wave field that is composed can be controlled manually according to a target occurrence and has better prospecting effect to the target body of a steep dip, as compared with the common seismic prospecting method based on the single seismic focus; the seismic prospecting method of the invention also has the advantages of low operation cost and simple operation as compared with a phased seismic prospecting method.

Description

Technical field:

[0001] The invention relates to a seismic prospecting method, which is especially suitable for the seismic prospecting method of single seismic source directional illumination in areas with strong background noise and low signal-to-noise ratio. Background technique:

[0002] The existing vibrator seismic exploration methods can be divided into two categories according to the number of seismic sources involved in the work. One is single vibrator seismic exploration; the other is array vibroseis seismic exploration. The seismic wavefield excited by a single vibroseis in the underground half-space can be approximated as a spherical wavefield with no directionality; the seismic wavefield excited by an array vibroseis has obvious directionality, and the main beam direction of the seismic wavefield excited by the combined vibrator is perpendicular to the ground. Under normal circumstances, the seismic wave field excited by the phase-controlled vibrator also has d...

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